He rarely cracks a smile at the best of times, but Kanye West is said to be unhappy with Pharrell Williams’ rumoured sponsorship deal with Adidas.

The Blood On The Leaves rapper is reportedly keeping a close eye on the Happy hitmaker following reports that he is close to signing a deal with the same sportswear brand that he has been commissioned to design a clothing range for.

‘They are competitive in both music and fashion, Kanye always watches what Pharrell does,’ a source told The Sun. ‘He thinks having a similar artist working on their own brand for Adidas will make his collection less special.’

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Not happy: Kanye West, seen here making an entrance at Paris Fashion Week on Thursday, is said to feel threatened by Pharrell Williams' rumoured sponsorship deal with Adidas

Kanye signed a deal with Adidas in December last year after a spat with the Nike - over royalties for his exclusive collection of Air Yeezy sneakers - which resulted in the end of his business relationship with the sportswear brand.